<template>
  <div>count的值为：{{ count }}</div>
  <button @click="addCount">count+1</button>
</template>
<script setup>
import { ref } from 'vue'
const count = ref(1)
const addCount = event => {
  count.value++
  if (count.value % 2 === 0) { event.target.style.border = '5px dotted' } 
  else { event.target.style.border = '5px solid' } }
</script>